Qarah Kahriz () is a village in Ashna Khvor Rural District of the Central District of Khomeyn County, Markazi province, Iran.
At the time of the 2006 National Census, the village's population was 966 in 211 households. The following census in 2011 counted 890 people in 225 households. The 2016 census measured the population of the village as 929 people in 232 households. It was the most populous village in its rural district.